Tokuyama Hideaki, Hamaguchi Ryosuke
Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan.
Gels. 2022 Feb 21;8(2):137. doi: 10.3390/gels8020137.
A TiO nanoparticle-loaded polymer fiber web was developed as a functional material with the ability to adsorb and photo-catalytically degrade organic pollutants in aquatic media. A linear copolymer of -isopropylacrylamide (primary component) and -methylol acrylamide (poly(NIPA--NMA)) was prepared, and composite fibers were fabricated by electrospinning a methanol suspension containing the copolymer and commercially available TiO nanoparticles. The crosslinking of the polymer via the formation of methylene bridges between NMA units was accomplished by heating, and the fiber morphology was analyzed by electron microscopy. 4-Isopropylphenol generated by the degradation of bisphenol A-one of the endocrine-disrupting chemicals-was used as the model organic pollutant. As poly(NIPA) is a thermosensitive polymer that undergoes hydrophilic/hydrophobic transition in water, the temperature-dependence of the adsorption and photocatalytic degradation of 4-isopropylphenol was investigated. The degradation rate was analyzed using a pseudo-first-order kinetic model to obtain the apparent reaction rate constant, . The enhancement of the photocatalytic degradation rate owing to the adsorption of 4-isopropylphenol onto thermosensitive poly(NIPA)-based fibers is discussed in terms of the ratio of the of the composite fiber to that of unsupported TiO nanoparticles. Based on the results, an eco-friendly wastewater treatment process involving periodically alternated adsorption and photocatalytic degradation is proposed.
一种负载二氧化钛纳米颗粒的聚合物纤维网被开发为一种功能材料，它能够吸附并光催化降解水介质中的有机污染物。制备了由N-异丙基丙烯酰胺（主要成分）和N-羟甲基丙烯酰胺组成的线性共聚物（聚（NIPA-NMA）），并通过静电纺丝含有该共聚物和市售二氧化钛纳米颗粒的甲醇悬浮液来制造复合纤维。通过加热实现聚合物通过NMA单元之间形成亚甲基桥的交联，并通过电子显微镜分析纤维形态。由双酚A（一种内分泌干扰化学物质）降解产生的4-异丙基苯酚被用作模型有机污染物。由于聚（NIPA）是一种在水中经历亲水/疏水转变的热敏聚合物，因此研究了4-异丙基苯酚吸附和光催化降解的温度依赖性。使用伪一级动力学模型分析降解速率以获得表观反应速率常数k。基于复合纤维与无负载二氧化钛纳米颗粒的k值之比，讨论了由于4-异丙基苯酚吸附到基于热敏聚（NIPA）的纤维上而导致的光催化降解速率的提高。基于这些结果，提出了一种涉及周期性交替吸附和光催化降解的环保废水处理工艺。
